code refactoring for Vivado compatibility

hw/rtl/libs/VX_mux.sv

@@ -0,0 +1,21 @@
+`include "VX_platform.vh"
+
+`TRACING_OFF
+module VX_mux #(
+    parameter DATAW = 1,
+    parameter N     = 1,
+    parameter LN    = $clog2(N)
+) (
+    input wire [N-1:0][DATAW-1:0] data_in,    
+    input wire [LN-1:0]           sel_in,    
+    output wire [DATAW-1:0]       data_out
+); 
+    if (N > 1) begin
+        assign data_out = data_in[sel_in];
+    end else begin
+        `UNUSED_VAR (sel_in)
+        assign data_out = data_in;
+    end
+
+endmodule
+`TRACING_ON